Furnace.



PATENTED MAY 1, 1906.

D. W. BOVBE.

FURNACE.

APPLIOATION HLBD'VDEO. so, 1904.

2 SHEETS-SHEET l,

PATENTBD MAY l, 1906.

D. W. BOVEE.

PURNAGE. APPLIOATION FILED DEO. 30, 1904` 2 SHEETS-SHEET 2.

IINITED STATES PATENT OFFICE.

FURNACE.

Specification of Letters Patent.

Patented May 1, 1906.

Application filed December 80, 1904. Serial No. 239,016-

To all whom, it may concern:

Be it known that I, DAvrD WV. Bovnn, a citizen of the United States,residing at Vaterloo, in the county of Blackhawk and State of Iowa, haveinvented certain new and useful Improvements in Furnaces, of which thedifferent parts of the house.

following is a specification, reference being had therein to theaccompanying drawings.

My invention relates to improvements in furnaces, and pertains to thatclass known as hot-air furnaces.

The object of my invention is to provide a furnace of this character inwhich the air to be heated is taken from the house and caused to becirculated around the fire-pot and discharged again into different pipesleading to the different parts of the house, thus causing a circulationof air through the house and at the same time taking a portion of saidair and discharging it into the fire-pot above the fuel, thus disposingof the same and also causing a more perfect combustion of the gasesabove the fuel. The burning of a portion of the air from the house willcause a certain amount of fresh air to be drawn in from the outsidethrough any crevices or keyholes, and thus the house will be thoroughlyventilated at all times, as a certain amount of the heated and foul airis being disposed of.

Another object of my invention is to provide means for more thoroughlyheating the air by causing a longer passage of the smoke and gasesthrough the air-space around the furnace In the accompanying drawings,Figure 1 is a side elevation of my improved furnace, showing the outercasing broken away and a portion of the fire-pot also broken away. Fig.2 is a transverse horizontal sectional view taken on the line x, Fig. 1.Fig. 3 is an enlarged perspective View of the door portion of thefurnace, showing the damper-operating mechanism carried thereby. Fig. 4is an enlarged perspective view of the adjustable connection between thearm and the door.

Referring now to the drawings, A represents the furnace, which may bemade of any desired structure, but is made in the usual form with theouter casing B and the fire-pot C located centrally therein and of asize to have a space D surrounding the same, and in which is heated theair to be furnished to the Communicating with the space D and the lowerend thereof or adjacent the bottom of the furnace is the usual cold-airpipe E, which feeds the air around the fire-pot, and thus the airbecomes heated and is discharged from the upper 'end of the furnace bypipes F, and by means of which the air is conveyed to the differentportions of the house. The cold-air pipe E is in most instances incommunication with the outside atmosphere and in some instances with thehouse, and in the latter case the same air is constantly circulatedthrough the house, and in order to ventilate the house the windows ordoors have to be opened, and the foul air will still remain in thehouse. In my device the air is constantly circulated through the house;but a certain amount of the same is at all times being disposed of andwill necessarily not allow the atmosphere as a whole to become so foul,and a certain amount of fresh air will have to take the place of thefoul or warm air that is being discharged above the fuel.

The fire-pot C, as shown, is constructed in the usual manner and is incommunication with the outside of the furnace by a doorcasing G, whichis tightly secured to the firepot C, and the outside casing B and thefirepot adjacent said door-casing is provided with an opening H,whichhas communicating therewith a pipe H, which extends inwardly to thecenter thereof above the fuel, and the said pipe being of such a size inproportion to the cold-air-inlet pipe E that the amount of air fed tothe fire-box is small in proportion to the amount of air taken into theair-space D around the fire-box, and thus the circulation of the airfrom the furnace to the different parts of the house and back throughthe cold-air pipe E is maintained. The coldair pipe E is preferably incommunication with one of the rooms adjacent the furnace and near thefloor thereof, so that the cold or unheated air is drawn from the roomto the furnace. The inner end of the pipe H is turned downward at h, sothat the air discharged therefrom will be discharged adjacent the fuel,and thus cause the same to spread over a greater surface.

The fire-box C on the outside opposite the opening H is provided with aswinging door or damper I, which is hinged at its upper end at 'i andswings down and is by gravity normally held in a vertical positionclosing the opening H, and thus prevents the air from passingfrom theair-space D to the fire-pot. The said damper or door I has securedthereto adjacent its lower end a chain J, which eX- ICO IIC

tends outward through an opening in the outer casin B of the furnaceadjacent the door-framegr and is secured to an arm Z, carried by -thefurnace-door L, the chain J being of such a length that the door ordamper closing the pipe H will be held open when the furnace-door L isclosed, and when the door is opened the arm Z is moved inward, thusloosening the chain J and causing the door or damper I to close the pipeH.

When the furnace-door is opened, it is well known that there ispractically no draft through the fire, and thus it is very essentialthat the pipe H be closed to prevent a back draft through the said pipeinto the space D surrounding the fire-box, and thus filling the housewith smoke and gases. It is readily seen that the moment thefurnace-door is opened for any purpose whatever the pipe H is closed jbut when the door is closed the damper I is raised and the draft throughthe fire being continued vwill cause air to be fed fron the space D tothe fire-pot above the fue The arm l, as shown, is provided at its innerend with a ratchet-surface c, which rests upon a similar surface m,carried by the arm M, which is rigidly secured to the furnacedoor L, andpassing through the arm vl and arm M is a bolt d, which is provided witha thumb-nut e and by means of which the arm Z may be held in itsadjusted position, and thus the chain J can be either tightened orloosened, thus increasing or decreasing thel movement of the damper I,whereby the amount of air fed to the fire may be readily regulated, asthe circumstances may require.

The fire-box C in my device is of the usual structure with a nat upperend N, which has secured thereon the smoke and gas conveying iue O,which causes a longer passage of the smoke and gases within theair-space D, and thus more thoroughly heats the air therein. This isaccom lished by having the upper flat end N of the e-pot provided withthe two openings P and P, which discharge the gas'es and smoke into nuesp and p', which extend toward each other and communicate with a centralflue Q', which extends all the way across the furnace and communicateswith the smoke-pipe R, which conveys the gases and smoke 0E to thechimney. The said flues p and p are composed of a vertically-disposedplate S,`which rests upon the flat top N of the fire-pot and securedthereto in any desired manner and so curved as to form the nuesheretofore described. The upper end of the plate S has secured thereon aflat plate T, which closes the same and forms the two channels U and U,which form a greater heating-surface for hot air within the space D. Thesaid iiue Q adjacent its communication with the smoke-pipe is providedwith an opening Q, which communicates directlywith the fire-pot, andthus a direct draft can be established between the fire-pot and thesmoke-pipe, thus causing a greater draft to be used when making a newfire or when it is desired to more rapidly allow the fire to burn up.The said opening on each side is provided with guides g, in which isslidably mounted a damper V, which has pivotally connected thereto anoperatingarm V, which extends out through the front of the furnace andis provided with a handle o, by means of which the rod is moved in orout, and whereby the draft is caused to travel either directly throughthe opening Q to the smoke-pipe or indirectly by closing said opening,as heretofore fully described.

' Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A furnace of the character described, comprising an outer casing, afurnace-door carried by said casing, a fire-pot within the casing andforming a hot-air space between the nre-pot and the casing, the saidfire-pot having an opening communicating with the hot-air space abovethe fuel, and means whereby said opening is closed when the furnace-dooris open.

2. A furnace of the character described,

comprising an outer casing, a furnace-door carried by the casing, afire-pot within the casing and forming a hot-air space between thefire-pot and the casing, said Jnre-pot having an opening communicatingwith the hotair space, a swinging damper closing said opening, and meanscarried by the furnacedoor for holding the damper open when the door isclosed.

3. A furnace of the character described, comprising an outer casing, afurnace-door carried by the casing, a re-pot within the casing andforming a hot-air space between the fire-pot and the casing', saidfire-pot having an opening communicating with the space between thecasing and the fire-pot, a swinging damper closing the opening and achain connection between said damper and the furnace-door for normallyholding the damper open when the door is closed.

4. A furnace of the character described, comprising an outer casing, afurnace-door carried by the casing, a fire-pot within the casing andforming a hot-air space between the casing and the fire-pot, saidfire-pot having an opening communicating with the said hot-air space, aswinging damper closing said opening, an arm carried by thefurnace-door, and a flexible connection between the said arm and damper,whereby the damper is open when the door is closed.

5. A furnace comprising a fire-pot, a casing surrounding said fire-potand forming a hot-air space between the fire-pot and the casing, aninwardly-extending pipe carried by the fire-pot and in communicationwith IOO IZO

' the hot-air space, a swinging damper closing 13o said pipe, afurnace-,door carried by the casing, an arm carried by the furnace-door,means for adjusting said arm, and a chain connection between said armand damper.

6. A furnace of the character described, comprising an outer casing, afurnace-door carried by the casing, a fire-pot within the casing andforming an air-space between the casing and the fire-pot, aninwardly-extending pipe carried by the hre-pot and in communication withthe space around the same, a swinging damper carried by the fire-potwithin the air-space and normally closing said pipe, an arm carried bythe furnace-door, a chain connection between said arm and damper, andmeans for adjusting said arm, whereby the movement of the damper isregulated.

7. A furnace of the character described, comprising an outer casing, afurnace-door carried thereby, a fire-pot within the casing and forming ahot-air space between the firepot and the casing, an inwardly-extendingpipe carried by the fire-pot above the fuel and having adownwardly-turned end at the center of the fire-pot, and its oppositeend in communication with the hot-air space, a swinging damper normallyclosing the outer end of said pipe, an arm carried by the furnace-door,a chain connection between said arm and damper, and means for adjustingthe said arm, whereby the movement of the damper is regulated.

8. A furnace of the character described, comprising an outer casing, afurnace-door carried by the casing, a fire-pot within the casing andforming a hot-air space between the casing and fire-pot, said fire-pothaving an opening communicating with the hot-air space, a swingingdamper closing said opening, and a flexible connection between saiddamper and the furnace-door for normally holding the damper open whenthe door is closed.

9. A furnace of the character described, comprising an outer casing, afurnace-door carried by the casing,'a fire-pot within the casing andforming a hot-air space between the casing and the fire-pot, aninwardly-extending pipe carried by the fire-pot above the fuel andhaving a downwardly-turned end at the center of the fire-pot and incommunication with the hot-air space, and means connected to thefurnace-door for closing the said pipe when the door is opened.

l0. A furnace of the character described,

comprising an outer casing, a furnace-door carried by the casing, anre-pot within the casing and forming a hot-air space between the casingand the fire-pot, an inwardly-extending pipe carried by the fire-potabove the fuel and having a downwardly-turned end in communication withthe fire-pot, a swinging damper normally closing the outer end of saidpipe, an arm pivotally connected to the furnace-door, means for holdingsaid arm in its adjusted position, and a connection between said arm anddamper, whereby the damper is closed when the door is opened.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID w. BovEE.

Vitnesses:

A. S. PATTIsoN, C. R. VRIGHT, Jr.

